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<span class="token annotation punctuation">@Builder</span>
<span class="token annotation punctuation">@ToString</span>
<span class="token annotation punctuation">@NoArgsConstructor</span>
<span class="token annotation punctuation">@AllArgsConstructor</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Employee</span> <span class="token keyword">implements</span> <span class="token class-name">Serializable</span> <span class="token punctuation">{</span>
    <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">long</span> serialVersionUID <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">9079722457749166858L</span><span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">String</span> name<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">Integer</span> age<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">Double</span> salary<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p>接下来，我们在TestLambda类中定义一个成员变量employees，employees变量是一个List集合，存储了Employee的一个列表，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">protected</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Employee</span><span class="token punctuation">&gt;</span></span> employees <span class="token operator">=</span> <span class="token class-name">Arrays</span><span class="token punctuation">.</span><span class="token function">asList</span><span class="token punctuation">(</span>
    <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token string">&quot;张三&quot;</span><span class="token punctuation">,</span> <span class="token number">18</span><span class="token punctuation">,</span> <span class="token number">9999.99</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token string">&quot;李四&quot;</span><span class="token punctuation">,</span> <span class="token number">38</span><span class="token punctuation">,</span> <span class="token number">5555.55</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token string">&quot;王五&quot;</span><span class="token punctuation">,</span> <span class="token number">60</span><span class="token punctuation">,</span> <span class="token number">6666.66</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token string">&quot;赵六&quot;</span><span class="token punctuation">,</span> <span class="token number">8</span><span class="token punctuation">,</span> <span class="token number">7777.77</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token string">&quot;田七&quot;</span><span class="token punctuation">,</span> <span class="token number">58</span><span class="token punctuation">,</span> <span class="token number">3333.33</span><span class="token punctuation">)</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>前期的准备工作完成了，接下来，我们就可以实现具体的业务逻辑了。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Test</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">test1</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token class-name">Collections</span><span class="token punctuation">.</span><span class="token function">sort</span><span class="token punctuation">(</span>employees<span class="token punctuation">,</span> <span class="token punctuation">(</span>e1<span class="token punctuation">,</span> e2<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>e1<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> e2<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span> e1<span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">compareTo</span><span class="token punctuation">(</span>e2<span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> <span class="token class-name">Integer</span><span class="token punctuation">.</span><span class="token function">compare</span><span class="token punctuation">(</span>e1<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> e2<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    employees<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token operator">::</span><span class="token function">println</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>上述代码比较简单，我就不赘述具体逻辑了。运行test1方法，得出的结果信息如下所示。</p> <div class="language-bash line-numbers-mode"><pre class="language-bash"><code>Employee<span class="token punctuation">(</span>name<span class="token operator">=</span>赵六, <span class="token assign-left variable">age</span><span class="token operator">=</span><span class="token number">8</span>, <span class="token assign-left variable">salary</span><span class="token operator">=</span><span class="token number">7777.77</span><span class="token punctuation">)</span>
Employee<span class="token punctuation">(</span>name<span class="token operator">=</span>张三, <span class="token assign-left variable">age</span><span class="token operator">=</span><span class="token number">18</span>, <span class="token assign-left variable">salary</span><span class="token operator">=</span><span class="token number">9999.99</span><span class="token punctuation">)</span>
Employee<span class="token punctuation">(</span>name<span class="token operator">=</span>李四, <span class="token assign-left variable">age</span><span class="token operator">=</span><span class="token number">38</span>, <span class="token assign-left variable">salary</span><span class="token operator">=</span><span class="token number">5555.55</span><span class="token punctuation">)</span>
Employee<span class="token punctuation">(</span>name<span class="token operator">=</span>田七, <span class="token assign-left variable">age</span><span class="token operator">=</span><span class="token number">58</span>, <span class="token assign-left variable">salary</span><span class="token operator">=</span><span class="token number">3333.33</span><span class="token punctuation">)</span>
Employee<span class="token punctuation">(</span>name<span class="token operator">=</span>王五, <span class="token assign-left variable">age</span><span class="token operator">=</span><span class="token number">60</span>, <span class="token assign-left variable">salary</span><span class="token operator">=</span><span class="token number">6666.66</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>如果想倒叙输出如何处理呢，只需要在将<code>return Integer.compare(e1.getAge(), e2.getAge());</code>修改成<code>-return Integer.compare(e1.getAge(), e2.getAge());</code>即可，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Test</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">test1</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token class-name">Collections</span><span class="token punctuation">.</span><span class="token function">sort</span><span class="token punctuation">(</span>employees<span class="token punctuation">,</span> <span class="token punctuation">(</span>e1<span class="token punctuation">,</span> e2<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>e1<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> e2<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span> e1<span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">compareTo</span><span class="token punctuation">(</span>e2<span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> <span class="token operator">-</span><span class="token class-name">Integer</span><span class="token punctuation">.</span><span class="token function">compare</span><span class="token punctuation">(</span>e1<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> e2<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    employees<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token operator">::</span><span class="token function">println</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>再次运行test1方法，得出的结果信息如下所示。</p> <div class="language-bash line-numbers-mode"><pre class="language-bash"><code>Employee<span class="token punctuation">(</span>name<span class="token operator">=</span>王五, <span class="token assign-left variable">age</span><span class="token operator">=</span><span class="token number">60</span>, <span class="token assign-left variable">salary</span><span class="token operator">=</span><span class="token number">6666.66</span><span class="token punctuation">)</span>
Employee<span class="token punctuation">(</span>name<span class="token operator">=</span>田七, <span class="token assign-left variable">age</span><span class="token operator">=</span><span class="token number">58</span>, <span class="token assign-left variable">salary</span><span class="token operator">=</span><span class="token number">3333.33</span><span class="token punctuation">)</span>
Employee<span class="token punctuation">(</span>name<span class="token operator">=</span>李四, <span class="token assign-left variable">age</span><span class="token operator">=</span><span class="token number">38</span>, <span class="token assign-left variable">salary</span><span class="token operator">=</span><span class="token number">5555.55</span><span class="token punctuation">)</span>
Employee<span class="token punctuation">(</span>name<span class="token operator">=</span>张三, <span class="token assign-left variable">age</span><span class="token operator">=</span><span class="token number">18</span>, <span class="token assign-left variable">salary</span><span class="token operator">=</span><span class="token number">9999.99</span><span class="token punctuation">)</span>
Employee<span class="token punctuation">(</span>name<span class="token operator">=</span>赵六, <span class="token assign-left variable">age</span><span class="token operator">=</span><span class="token number">8</span>, <span class="token assign-left variable">salary</span><span class="token operator">=</span><span class="token number">7777.77</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>结果符合我们的需求。</p> <h2 id="案例二"><a href="#案例二" class="header-anchor">#</a> 案例二</h2> <h3 id="需求-2"><a href="#需求-2" class="header-anchor">#</a> 需求</h3> <p>1.声明函数式接口，接口中声明抽象方法<code>public String getValue(String str);</code></p> <p>2.声明类TestLambda，类中编写方法使用接口作为参数，将一个字符串转换为大写，并作为方法的返回值。</p> <p>3.再将一个字符串的第2个和第4个索引位置进行截取子串。</p> <h3 id="实现-2"><a href="#实现-2" class="header-anchor">#</a> 实现</h3> <p>首先，创建一个函数式接口MyFunction，在MyFunction接口上加上注解@FunctionalInterface标识接口是一个函数式接口。如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@FunctionalInterface</span>
<span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">MyFunction</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">getValue</span><span class="token punctuation">(</span><span class="token class-name">String</span> str<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>在TestLambda类中声明stringHandler方法，参数分别为待处理的字符串和函数式接口的实例，方法中的逻辑就是调用函数式接口的方法来处理字符串，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">stringHandler</span><span class="token punctuation">(</span><span class="token class-name">String</span> str<span class="token punctuation">,</span> <span class="token class-name">MyFunction</span> myFunction<span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token keyword">return</span> myFunction<span class="token punctuation">.</span><span class="token function">getValue</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>接下来，我们实现将一个字符串转换为大写的逻辑，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Test</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">test2</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token class-name">String</span> value <span class="token operator">=</span> <span class="token function">stringHandler</span><span class="token punctuation">(</span><span class="token string">&quot;binghe&quot;</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>s<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> s<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>运行test2方法，得出如下的结果信息。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code>BINGHE
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>我们再来实现字符串截取的操作，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Test</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">test3</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token class-name">String</span> value <span class="token operator">=</span> <span class="token function">stringHandler</span><span class="token punctuation">(</span><span class="token string">&quot;binghe&quot;</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>s<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> s<span class="token punctuation">.</span><span class="token function">substring</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p><strong>注意：需求中是按照第2个和第4个索引位置进行截取子串，字符串的下标是从0开始的，所以这里截取字符串时使用的是substring(1, 3)，而不是substring(2, 4)，这也是很多小伙伴容易犯的错误。</strong></p> <p><strong>另外，使用上述Lambda表达式形式，可以实现字符串的任意处理，并返回处理后的新字符串。</strong></p> <p>运行test3方法，结果如下所示。</p> <div class="language-bash line-numbers-mode"><pre class="language-bash"><code><span class="token keyword">in</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="案例三"><a href="#案例三" class="header-anchor">#</a> 案例三</h2> <h3 id="需求-3"><a href="#需求-3" class="header-anchor">#</a> 需求</h3> <p>1.声明一个带两个泛型的函数式接口，泛型类型为&lt;T, R&gt;，其中，T作为参数的类型，R作为返回值的类型。</p> <p>2.接口中声明对象的抽象方法。</p> <p>3.在TestLambda类中声明方法。使用接口作为参数计算两个long型参数的和。</p> <p>4.再就按两个long型参数的乘积。</p> <h3 id="实现-3"><a href="#实现-3" class="header-anchor">#</a> 实现</h3> <p>首先，我们按照需求定义函数式接口MyFunc，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@FunctionalInterface</span>
<span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">MyFunc</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">,</span> <span class="token class-name">R</span><span class="token punctuation">&gt;</span></span> <span class="token punctuation">{</span>

    <span class="token class-name">R</span> <span class="token function">getValue</span><span class="token punctuation">(</span><span class="token class-name">T</span> t1<span class="token punctuation">,</span> <span class="token class-name">T</span> t2<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>接下来，我们在TestLambda类中创建一个处理两个long型数据的方法，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">operate</span><span class="token punctuation">(</span><span class="token class-name">Long</span> num1<span class="token punctuation">,</span> <span class="token class-name">Long</span> num2<span class="token punctuation">,</span> <span class="token class-name">MyFunc</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Long</span><span class="token punctuation">,</span> <span class="token class-name">Long</span><span class="token punctuation">&gt;</span></span> myFunc<span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>myFunc<span class="token punctuation">.</span><span class="token function">getValue</span><span class="token punctuation">(</span>num1<span class="token punctuation">,</span> num2<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>我们可以使用下面的方法来完成两个long型参数的和。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Test</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">test4</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token function">operate</span><span class="token punctuation">(</span><span class="token number">100L</span><span class="token punctuation">,</span> <span class="token number">200L</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>x<span class="token punctuation">,</span> y<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> x <span class="token operator">+</span> y<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>运行test4方法，结果如下所示。</p> <div class="language-bash line-numbers-mode"><pre class="language-bash"><code><span class="token number">300</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>实现两个long型数据的乘积，也很简单。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Test</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">test5</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token function">operate</span><span class="token punctuation">(</span><span class="token number">100L</span><span class="token punctuation">,</span> <span class="token number">200L</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>x<span class="token punctuation">,</span> y<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> x <span class="token operator">*</span> y<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>运行test5方法，结果如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token number">20000</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>看到这里，我相信很多小伙伴已经对Lambda表达式有了更深层次的理解。只要多多练习，就能够更好的掌握Lambda表达式的精髓。</p> <h2 id="写在最后"><a href="#写在最后" class="header-anchor">#</a> 写在最后</h2> <blockquote><p>如果你觉得冰河写的还不错，请微信搜索并关注「 <strong>冰河技术</strong> 」微信公众号，跟冰河学习高并发、分布式、微服务、大数据、互联网和云原生技术，「 <strong>冰河技术</strong> 」微信公众号更新了大量技术专题，每一篇技术文章干货满满！不少读者已经通过阅读「 <strong>冰河技术</strong> 」微信公众号文章，吊打面试官，成功跳槽到大厂；也有不少读者实现了技术上的飞跃，成为公司的技术骨干！如果你也想像他们一样提升自己的能力，实现技术能力的飞跃，进大厂，升职加薪，那就关注「 <strong>冰河技术</strong> 」微信公众号吧，每天更新超硬核技术干货，让你对如何提升技术能力不再迷茫！</p></blockquote> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200906013715889.png" loading="lazy" class="lazy"></p></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/binghe001/BingheGuide/edit/master/docs/md/core/java/java8/2022-03-31-004-Lambda表达式典型案例，你想要的的都在这儿了.md" target="_blank" rel="noopener noreferrer">在 GitHub 上编辑此页</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">上次更新: </span> <span class="time">2022/5/23</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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